CTR (Click Through Ratio) plays a big role in monetisingyour website. Earnings can be improved with a few tips to increase your CTR.

1. Better Ad Placement : A good placement of Adblock can increase the CTR substantially. Above the “fold” is a preferable placement. A large rectangle at the upper fold can draw attention to the ads. A Leaderboard adblock can also perform well there. Similarly, a link unit under the navigation menu can also increase CTR. For Blogs and Content Sites, A large rectangle wrapped in the contents can also perform good. And, when visitors reach at the bottom of the page, they might want to leave your site to find a better resource. So, why not give them a chance to click on ads while they leave. Adding a Leaderboard or link unit just above the footer might be useful for this.
2. Blending Ads : Blending ads also plays a big role in CTR. Blending helps to camouflaged the ads. The title of the ads should be similar in color to the links of your site and the description and the url should be similar in color to your content. The background and border of your ad unit should match your page’s background which will make it hard to distinguish between the adblock and your content.
You can also attract visitors to ads by placing a high contrast adblock (Like, using a black background and white ads for a white background site). Remember, visitors will surely be attracted, but you may loose returning visitors.
3. Relevant Ads : When a visitor comes to your site,  provide them the useful information so they will stay. They will only click on the ads when they find it related to what they are looking for. You would not expect them to click on a washing machine ad on your jewelry site. So, getting targeted ads is a must.